Automatic regulator for dampers.



I N. c. LOGKE. AUTOMATIC REGULATOR FOR DAMPERS.

APPLICATION FILED JUNE 5, 1907.

Patented June 8. 1909.

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c D. M m m u w W 0 C s m T E P m R R a u E n 1 UNITED STATES PATENT Er,

NATHANIEL CHASE LOCKE, OF SALEM, MASSACHUSETTS, ASSIGNORTOLOCKER-EGULATOR COMPANY, OF SALEM, MASSACHUSETTS.

AUTOMATIC REGULATOR FOR DAMPERS.

Specification of Letters Patent.

Patented June 8, 1909.

Application filed June 5, 1907. Serial No. 377,287.

To all whom it may concern:

Be it lmown that I, NATHANIEL C. LOOKE, a citizen of the United States,residing at Salem, county of Essex, and State of Massachusetts, haveinvented a new and useful,

Improvement in Automatic Regulators for Dampers, of which the followingis a specifi-.

cation.

This invention relates to automaticregulators for dampers, of thetypewherein the damper operating motor or piston is moved in onedirection by water or other non- Another object of the invention is toprovide a damper operating motor of greater power and efliciency.

A further object of the invention is to provide a controlling valve oflmproved con-I struction and operation.

With these and other objects in view, my invention consists in thematters inafter described and claimed.

In the accompanying drawings, wherein similar reference numerals arefused 'to indicate corresponding parts in .the different views, Figure 1is a side elevation, partly in section, of a deviceembodying myinvention; and Fig. 2 is a detail sectional view of the valve casing,ona larger scale.

My device as an entirety comprises, as in my aforesaidPatent No.393,164, to which reference is made for fuller description andoperation. of parts forming no essential feature of my presentinvention, a base 1 and supporting frame 2, 3 and 4, a pressure chamber32, being secured to the base, which is in communication by piping 45,with the steam space of a boiler (not shown) or other source of powerwhich it is desired to regulate or control.

The upper wall of the pressure chamber 32 is formed of a flexiblediaphragm 32 beam resting on to its fulcrum, said strut 10, beingcarried by a stout metal flange disk 34, secured to be here-,

secured to the upper margins of its cylindric supporting shell 5, by acylindric shell or 'casting 35, said shells 5 and 35 being provided withoutwardly: extending flanges 7 and 8, between which the margins of thediaphragm are secured steam tight in well known manner.

A scale beam 30 is fulcrumed at 9, on the upright 2 of the frame, andcarries at its outer end an adjustable and stationary weight 42 and 43respectively, the scale a-strut 10 closely adjacent centrally to thediaphragm 32*, all as fully described in my prior patent herein referredto, and serving the same functions. The scale beam is limited in itsmovements by the screws 3* and 3', located in lugs on the standard 3, asdescribed in said patent, and connected with the scale beam between theweights and fulcrum'is a yoke 28, connected at top with the valve rod 17of the valve casing 29.

As stated in my prior patent N 0. 393,164, before referred to, the valverod 17 is raised by the upward movement of the scale beam or lever 30,due to excess of pressure in the pressure chamber 32, to permit the flowof waterfrom a source of supply under pressure through pipe 25, passage20 and pipe 24 to the damper controlling motor 36 to move its pistonj38in a direction to close a weighted damperof a furnace flue (not shown)through connections 42 and 43, and lowered upon reduction of saidvexcessof pressure to close the passage 20 and open the passage 20 to permitthe escape of waterfrom the damper motor 36, through pipe 24, passage 20and waste pipe 27.

For extreme closeness of operation when the apparatus and its motor 36are used as a damper motor to regulate the pressure of steam in theboiler, it is desirable to modify the action of the valve by slightlymoving the valve casing 29, and in order to accomplish this the pistonrod of the damper motor'is connected by cord or chain 40 with a lever31, provided at its fulcrum with a cam designed to move the pipe 24 andvalve casing u ward, to modify the action of the valve, all asfullydescribed in my prior patent N o.

In this class of devices it is important that the valve be soconstructed, arranged and manipulated as to be extremely sensitive, andfrom the condition of its use be practically free from sticking due tosediment or grit in the fluid controlled. To this end my presentinvention involves a valve casing 29, cast with lugs which are cored orbored to form ports 24, 25 and 27, and reamed longitudinally to receivecentrally planed annular plugs 16, 19, 20 and 21, which are seatedtherein with a driving fit, the first, 16, at the upper end of thecasing, above the port 27, the next, 19, in the space between the ports27 and 24, the next, 20, in the space between the ports 24 and 25, andthe last just below the supply port 25. he lower end of the valve bodyis threaded and provided with a cupped cap 22, which forms a chamber 22,at the lower end of the structure.

The valve proper consists of a long spindle 17, the lower end of whichis dressed on four sides to leave four narrow guiding webs to move incontact with the bore of the plug 21; the advantage of this constructionbeing two-fold; first it affords clearance for any grit or sus endedmatter in the water controlled whi e forming an efficient guide, andsecond, it permits the free passage of water under pressure downwardinto the high pressure chamber 22 thus admitting of water pressure 011the squared lower end of the spindle 17, thereby assisting in the promptaction of the regulator. The spindle is cut away at opposite sides to apoint just below the upper end of the bore of plug 20, and from belowthe lower edge of plug 1 9 to the shoulder at the lower end of thelarger diameter of the spindle, thus in the position shown in thedrawings, closing communication from the pressure pipe 25 to pipe 24 andso to the damper motor, and making communication from said pipe 24through the passage of plug 19 to the exhaust or waste pipe 27. Theupper part of the spindle works liquid tight through the plug 16, thevalve casing extending above the plug and constituting an oil cup 14,through which the spindle works. Preferably a felt washer 15 is securedto the upper face of the plug and a cap or cover 13 is preferablyemployed to exclude dust from the oil cup. The valve is connected to thedarriper motor by a pipe 24 leading to a channel 36 in the base of thecylinder, and rising from said channel is a pipe 37 communicating at itsupper end with the interior of the motor cylinder near the top, wherebywater is admitted to the cylinder above the piston, moving it downwardto close the weighted damper more or less, the piston rod beingconnected at its upper end to a cord or rope 43, the other end ofwhiehis connected to the damper as in my prior patents before referredto. When the valve shifts to shut off pressure water the weighted arm ofthe damper will raise the piston, thus discharging water from above it,through pipe 37, pipe 24, the passage in valve plug 19, and waste pipeor exhaust 27.

To provide for control of either high or low pressure in the generatorby practically the same machine, I employ a Hat disk diaphragm 32 forthe upper wall of the pressure chamber 32, said diaphragm being se curedbetween the top flange 7 of the side walls of said chamber by thecorresponding flange S of the superposed shell 35. This shell Iconstruct of uniform sizes exteriorly, but provide interiorly inwardlyextending flanges 35 of dill'erent widths extending a greater or lessdistance over the top of the diaphragm toward the center thereof, inorder that the diaphragm may have greater or less support against thepressure from the generator over more or less area. These shells 35 areof uniform size and in terchan geable, so that the same device may beeconomically fitted to control the damper of :1, generator of eitherhigh or low pressure. T he diaphragm is clamped. centrally betvmen twodisks, 34 and 44, the upper one of which, 34, carries the strut or post10, which moves the scale beam or lever 30.

In applicants former patent No. 393,164, the bottom chamber of the valvewas an exhaust chamber having no pressure, and a passage leading from itin the wall of the valve communicating with the exhaust chamber 18. Thebottom chamber in the casing in the present application is a highpressure chamber with the full pressure of the water acting upon thelower end of the valve spindle 17. The power heretofore that wasnecessary to be exerted upon this alve spindle to move it when there wassome considerable friction, caused. a variation of pressure on themachine as there was obliged. to be a decrease of pressure to force thespindle down and an increase to raise it up but with. the water actingbelow the spindle, this trouble is obviated and the regulator works verymuch closer.

Having thus fully described my invention, what I claim as new and desireto secure by Letters Patent of the United States is:

1. In a pressure controlling device, the combination with a water motor,a valve controlling the passage of fluid under pressure to said motor, apressure chamber communicating with a generator formed of the shellsclamping a diaphragm between them, the upper shell being interchangeablewith others and having a llange of greater or less width extending overthe diaihragm, and means for actuating the valve by the movement of thediaphragm.

2. In a pressure controlling device, the combination with a damper motorand pressure chamber, of a valve comprising a casing having an upperexhaust port, a lower inlet port, an outlet port intermediate of saidports, a discharge chamber communicating with the upper exhaust port, ahigh pressure chamber at the lower end of the casing, two interveningchambers between the discharge chamber and the high pressure chamber,one communicating with the lower inlet port and the other with theintermediate outlet port and the high pressure chamber, and a valvespindle extending through the upper discharge chamber and the twointervening chambers and having valved portions controlling the passagesbetween said chamber and the inlet and outlet ports and the exhaustport, the lower end of said valve spindle being located in a guidepassage way between the high pressure chamber at the bottom of thecasing and the lower intervening chamber and constructed and arranged toermit the free passage at all times of flui through said guide passageway .between the lower intervening chamber and the high pressurechamber.

3. In a pressure controlling device, the combination with a damper motorand pressure chamber, of a valve comprising a casing having an up erexhaust port, a lower inlet port, an outlet ort intermediate of saidport, an oil cham er at the top of the casing, a high pressure chamberat the bottom of 30 the casing, a discharge chamber below the oilchamber and communicating with the upper exhaust port, two interveningchambers between the upper discharge chamber and the high pressurechamber, the upper intervening chamber communicating with theintermediate outlet port, and the lower intervening chambercommunicating with the lower inlet port, and the high pressure chamber,and a valve spindle extending through all of said chambers to the highpressure chamber and having valved portions controlling the passagesbetween the discharge chamber and the intervening chamber and the inletand outlet ports, the lower end of said spindle being located andmovable in the passageway communicating between the high pressurechamber and the lower intervening chamber and rovided with means forcentering the end of the spindle in said assage way and permitting thepassage of uid at all times between the high pressure chamber and thelower intervening chamber.

In testimony whereof, I have hereunto signed my name in the presence oftwo subscribing witnesses.

NATHANIEL CHASE LOCKE. Witnesses:

A. P. SWAsEY, A. W. VITTY.

